#pragma once

#include "../common/Common.h"
#include "../common/Dispatcher.h"
#include "Request.h"
#include "RpcRegistry.h"
#include "RpcCaller.h"
#include "RpcTopic.h"

namespace rpc
{
    namespace client
    {

        class RegistryClient
        {
        public:
            using ptr = std::shared_ptr<RegistryClient>;

            RegistryClient(const string &ip, int port)
                : _request(std::make_shared<Request>()), _provider(std::make_shared<Provider>(_request)), _dispatcher(std::make_shared<Dispatcher>())
            {
                auto rspCb = std::bind(&Request::onResponse, _request.get(), _1, _2);
                _dispatcher->registerHandler<BaseMessage>(MType::RSP_SERVICE, rspCb);

                std::function<void(const BaseConnection::ptr &, BaseMessage::ptr &)> messageCb = std::bind(&Dispatcher::onMessage, _dispatcher.get(), _1, _2);
                _client = ClientFactory::create(ip, port);

                _client->setMessageCallback(messageCb);
                _client->connect();
            }

            // 向外提供的服务注册接口
            bool registerMethod(const string &method, const Address &host)
            {
                return _provider->registryMethod(_client->connection(), method, host);
            }

        private:
            Request::ptr _request;
            Provider::ptr _provider;
            Dispatcher::ptr _dispatcher;
            BaseClient::ptr _client;
        };

        class DiscoverClient
        {
        public:
            using ptr = std::shared_ptr<DiscoverClient>;

            // 构造函数传入注册中心的地址信息，用于连接注册中心
            DiscoverClient(const string &ip, int port, const Discover::OfflineCallback &cb)
                : _request(std::make_shared<Request>()), _discover(std::make_shared<Discover>(_request, cb)), _dispatcher(std::make_shared<Dispatcher>())
            {
                auto rspCb = std::bind(&Request::onResponse, _request.get(), _1, _2);
                _dispatcher->registerHandler<BaseMessage>(MType::RSP_SERVICE, rspCb);

                auto reqCb = std::bind(&Discover::onServiceRequest, _discover.get(), _1, _2);
                _dispatcher->registerHandler<ServiceRequest>(MType::REQ_SERVICE, reqCb);

                _client = ClientFactory::create(ip, port);

                std::function<void(const BaseConnection::ptr &, BaseMessage::ptr &)> messageCb = std::bind(&Dispatcher::onMessage, _dispatcher.get(), _1, _2);

                _client->setMessageCallback(messageCb);
                _client->connect();
            }

            // 向外提供的服务发现接口
            bool serviceDiscovery(const string &method, Address &host)
            {
                return _discover->serviceDiscovery(_client->connection(), method, host);
            }

        private:
            Request::ptr _request;
            Discover::ptr _discover;
            Dispatcher::ptr _dispatcher;
            BaseClient::ptr _client;
        };

        class RpcClient
        {
        public:
            using ptr = std::shared_ptr<RpcClient>;
            // enableDiscovery--是否启用服务发现功能，也决定了传入的地址信息是注册中心的地址，还是服务提供者的地址
            RpcClient(bool enableDiscovery, const std::string &ip, int port) : _enableDiscovery(enableDiscovery),
                                                                               _requestor(std::make_shared<Request>()),
                                                                               _dispatcher(std::make_shared<Dispatcher>()),
                                                                               _caller(std::make_shared<RpcCaller>(_requestor))
            {

                // 针对rpc请求后的响应进行的回调处理
                auto rsp_cb = std::bind(&client::Request::onResponse, _requestor.get(),
                                        _1, _2);
                _dispatcher->registerHandler<BaseMessage>(MType::RSP_RPC, rsp_cb);

                // 如果启用了服务发现，地址信息是注册中心的地址，是服务发现客户端需要连接的地址，则通过地址信息实例化discovery_client
                // 如果没有启用服务发现，则地址信息是服务提供者的地址，则直接实例化好rpc_client
                if (_enableDiscovery)
                {
                    auto offline_cb = std::bind(&RpcClient::delClient, this, _1);
                    _discovery_client = std::make_shared<DiscoverClient>(ip, port, offline_cb);
                }
                else
                {
                    std::function<void(const BaseConnection::ptr &, BaseMessage::ptr &)> message_cb = std::bind(&Dispatcher::onMessage, _dispatcher.get(),
                                                                                                                _1, _2);
                    _rpc_client = ClientFactory::create(ip, port);
                    _rpc_client->setMessageCallback(message_cb);
                    _rpc_client->connect();
                }
            }

            bool call(const std::string &method, const Json::Value &params, Json::Value &result)
            {
                // 获取服务提供者：1. 服务发现；  2. 固定服务提供者
                BaseClient::ptr client = getClient(method);
                if (client.get() == nullptr)
                {
                    return false;
                }
                // 3. 通过客户端连接，发送rpc请求
                return _caller->call(client->connection(), method, params, result);
            }
            bool call(const std::string &method, const Json::Value &params, RpcCaller::JsonAsyncResponse &result)
            {
                BaseClient::ptr client = getClient(method);
                if (client.get() == nullptr)
                {
                    return false;
                }
                // 3. 通过客户端连接，发送rpc请求
                return _caller->call(client->connection(), method, params, result);
            }
            bool call(const std::string &method, const Json::Value &params, const RpcCaller::JsonResponseCallback &cb)
            {
                BaseClient::ptr client = getClient(method);
                if (client.get() == nullptr)
                {
                    return false;
                }
                // 3. 通过客户端连接，发送rpc请求
                return _caller->call(client->connection(), method, params, cb);
            }

        private:
            BaseClient::ptr newClient(const Address &host)
            {
                std::function<void(const BaseConnection::ptr &, BaseMessage::ptr &)> message_cb = std::bind(&Dispatcher::onMessage, _dispatcher.get(),
                                                                                                            _1, _2);
                auto client = ClientFactory::create(host.first, host.second);
                client->setMessageCallback(message_cb);
                client->connect();
                putClient(host, client);
                return client;
            }
            BaseClient::ptr getClient(const Address &host)
            {
                std::unique_lock<std::mutex> lock(_mutex);
                auto it = _rpc_clients.find(host);
                if (it == _rpc_clients.end())
                {
                    return BaseClient::ptr();
                }
                return it->second;
            }
            BaseClient::ptr getClient(const std::string method)
            {
                BaseClient::ptr client;
                if (_enableDiscovery)
                {
                    // 1. 通过服务发现，获取服务提供者地址信息
                    Address host;
                    bool ret = _discovery_client->serviceDiscovery(method, host);
                    if (ret == false)
                    {
                        ELOG("当前 %s 服务，没有找到服务提供者！", method.c_str());
                        return BaseClient::ptr();
                    }
                    // 2. 查看服务提供者是否已有实例化客户端，有则直接使用，没有则创建
                    client = getClient(host);
                    if (client.get() == nullptr)
                    { // 没有找打已实例化的客户端，则创建
                        client = newClient(host);
                    }
                }
                else
                {
                    client = _rpc_client;
                }
                return client;
            }
            void putClient(const Address &host, BaseClient::ptr &client)
            {
                std::unique_lock<std::mutex> lock(_mutex);
                _rpc_clients.insert(std::make_pair(host, client));
            }
            void delClient(const Address &host)
            {
                std::unique_lock<std::mutex> lock(_mutex);
                _rpc_clients.erase(host);
            }

        private:
            struct AddressHash
            {
                size_t operator()(const Address &host) const
                {
                    std::string addr = host.first + std::to_string(host.second);
                    return std::hash<std::string>{}(addr);
                }
            };
            bool _enableDiscovery;
            DiscoverClient::ptr _discovery_client;
            Request::ptr _requestor;
            RpcCaller::ptr _caller;
            Dispatcher::ptr _dispatcher;
            BaseClient::ptr _rpc_client; // 用于未启用服务发现
            std::mutex _mutex;
            //<"127.0.0.1:8080", client1>
            std::unordered_map<Address, BaseClient::ptr, AddressHash> _rpc_clients; // 用于服务发现的客户端连接池
        };

        class TopicClient
        {
        public:
            TopicClient(const std::string &ip, int port) : _requestor(std::make_shared<Request>()),
                                                           _dispatcher(std::make_shared<Dispatcher>()),
                                                           _topic_manager(std::make_shared<TopicManager>(_requestor))
            {

                DLOG("建立连接...");
                auto rsp_cb = std::bind(&Request::onResponse, _requestor.get(),
                                        std::placeholders::_1, std::placeholders::_2);
                _dispatcher->registerHandler<BaseMessage>(MType::RSP_TOPIC, rsp_cb);

                auto msg_cb = std::bind(&TopicManager::onPublish, _topic_manager.get(),
                                        std::placeholders::_1, std::placeholders::_2);
                _dispatcher->registerHandler<TopicRequest>(MType::REQ_TOPIC, msg_cb);

                std::function<void(const BaseConnection::ptr &, BaseMessage::ptr &)> message_cb = std::bind(&Dispatcher::onMessage, _dispatcher.get(),
                                                                                                            std::placeholders::_1, std::placeholders::_2);

                _rpc_client = ClientFactory::create(ip, port);
                _rpc_client->setMessageCallback(message_cb);
                _rpc_client->connect();

                DLOG("建立连接成功...");
            }
            bool create(const std::string &key)
            {
                return _topic_manager->create(_rpc_client->connection(), key);
            }
            bool remove(const std::string &key)
            {
                return _topic_manager->remove(_rpc_client->connection(), key);
            }
            bool subscribe(const std::string &key, const TopicManager::SubCallback &cb)
            {
                return _topic_manager->subscribe(_rpc_client->connection(), key, cb);
            }
            bool cancel(const std::string &key)
            {
                return _topic_manager->cancel(_rpc_client->connection(), key);
            }
            bool publish(const std::string &key, const std::string &msg)
            {
                return _topic_manager->publish(_rpc_client->connection(), key, msg);
            }
            void shutdown()
            {
                _rpc_client->shutdown();
            }

        private:
            Request::ptr _requestor;
            TopicManager::ptr _topic_manager;
            Dispatcher::ptr _dispatcher;
            BaseClient::ptr _rpc_client; // 用于未启用服务发现
        };

    };
};